ASTM D6557 Standard Test Method for Evaluation of Rust Preventive Characteristics of Automotive Engine Oils
1. Scope
1.1 This test method covers a Ball Rust Test (BRT) procedure for evaluating the anti-rust ability of fluid lubricants. The procedure is particularly suitable for the evaluation of automotive engine oils under low-temperature, acidic service conditions.
1.2 Information Letters are published occasionally by the ASTM Test Monitoring Center (TMC) to update this test method. Copies of these letters can be obtained by writing the center.
1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.3.1 Exceptions - Where there is no direct equivalent, such as the units for screw threads, national pipe threads/diameters, and tubing size.
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. See 7.1.1-7.1.3 and 8.2.1.1.
2. Referenced Documents
2.1 ASTM Standards:
D4175 Terminology Relating to Petroleum, Petroleum Products, and Lubricants
D5844 Test Method for Evaluation of Automotive Engine Oils for Inhibition of Rusting (Sequence IID) (Withdrawn 2003)
3. Terminology
3.1 Definitions:
3.1.1 calibrate, v - to determine the indication or output of a device (e.g., thermometer, manometer, engine) with respect to a standard.
3.1.2 corrosion, n - the chemical or electrochemical reaction between a material, usually a metal surface, and its environment that can produce a deterioration of the material and its properties.
3.1.3 non-reference oil, n - any oil other than a reference oil, such as a research formulation, commercial oil, or candidate oil.
3.1.4 reference oil, n - an oil of known performance characteristics, used as a basis for comparison.
3.1.4.1 Discussion - Reference oils are used to calibrate testing facilities, to compare the performance of other oils, or to evaluate other materials (such as seals) that interact with oils.
3.1.5 rust (coatings), n - of iron or its alloys, a corrosion product consisting of hydrated iron oxides, usually reddish in color but can also be brown-to-black.
3.1.6 test oil, n - any oil subjected to evaluation in an established procedure.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 average gray value (AGV), n - measurement of brightness units on test specimens, indicating the degree of rust protection.
3.2.2 specimen, n - a carbon steel ball, 5.6 mm (AISI 1040).
